Improvement in thsottle-valves



G. F. MORSE. THROTTLE VALVE.

Patented May 14, 1867.

.rnitrb gram gaunt @ffirr.

IMPROVEMENT IN THROTTLE-VALVES.

an tlphnle teams in in the with intuit mu mating met at it: same.

no 1am, WHOM r-r' MAY- 6ONGERN=* Be it known that I, GEORGE F."1\IORSE,of Portland, in the county of Cumberland, andrState of Maine, haveinvented anew'and useful improved Balanced Throttle-Valve for-steamengines; and I hereby declare the following to be a full, clear, andexact description thereof,- whiehwill-enable others to make and use myinvention, ret'ercnce being had to .the accompanying drawings, formingpart ofthis specification, in which-- Figure 1 shows a longitudinalsection of my invention.

Figure 2, the same with the valve.

Figure 3, an end view.

Figure-4, a transverse section. v

My invention has in view a throttle-valve for steam cngineswhich shall,in operation, be so nearlybal ancd'as to lessen the f rictiomandconsists in the. arrangement of the parts and an application of the.samein the manner I will describe-as follows, firstreferring to the variousparts byletters.

a ashow two'portsin -.the body upon one side, and ,therearetwo-othercorresponding port's upon the opposite side inasimilarpositio-m. 'These two are clearly shown in fig'. 1. bshowsone oftwo ports in the valve. The form of the valve, with"its two ports, isseen in fig. 4, A representing the valve. .Two ports, one

for the admission of the steam into the casing or cylinder, D, andtheother for its .egress, are'mado in the cylinder; i Th ese are placed inthe same positions ,on opposite sides of the cylinder, and areillustrated at B. Upon the topofthe valve, and extending its length, isconstructed a channel, 0?. In the top of the cylinder is set the bolt k,projecting somewhat into the channel or groove, and operating as a guideto'the valve motion, andto l-teep Ehesamefrom turning As beforespecified, the object of my inventionsis-fto diminish the frictionof'the valve within thecasing or cylinder. 'As the steam venters thecasing or cylinder, andpasses through theports in the valve, it is alsoadmitted over the valve into the groove d, where its presence operatesas a counterbalance to the pressure on the under side of the valvethrough the portsa a; thus .the pressure of the valve against the uppersideof the casing or cylinder is counteracted by the steam in thechannel d, and the valve allowed, in consequence,- to move with-butslight friction. I

As seen in the drawing, the valve is cylindricalfthe ports are in thelower side of the-valve and the valve casing, and the channeld is uponthe opposite sidethereof. The-operation'and eil'ect of this-are to makethe valve nearly balanced, thus to lessen the friction, and to keep thevalve presseddown on its seat by the \lastic' quality of the steam inthe channel d. Without this channel at the valve would be pressed upwardby the force of the steam entering the ports of the casing, and, inconsequence, the valve would not always be kept tight, but with thearrangement, of the ports, the fo'rm of the valve, its nicely fittingthe cylind r, and the application of the channel 01, the valve is kepttight, wears even, and is held to its position on the seat,

a I do not claim con'structinga steam-chest with continuous circularports, both for the induction and exhaustion of the steam, so as to keepa constant and equal pressure of steam upon both ends and theperiphery-of a cylindrical piston-valve, neither do I claim apiston-valve composed of two heads which fit closely in the bore of acircular steam-chest, and are united-by a'cylindrical portion of lessdiameter than the heads, the steamchest being constructed with circular.ports or passages. I wish, still further, to disclaim making openingsthroughoutthe length of cylindrical valves which have reciprocatingmotions in their chests, so asto permit the steam to pass to that end ofthe chest which is furthest from the inductionpassagel The devicesreferred to in the first two disclaimers being exhibited in the patent.of Joseph Marks, January 24, 1854,":md thc last'in.

{the patent of C. W. Tremain, September 19, I865. invention is intendedto embrace simply the arrange ment of a cylindrical slidingthrottle-valve inthe casing, by having the steam openings uponone side,and-the channel 01 upon the other, ofthe valve, in order that tho steamupon one side may act as .a'coun'terpoise to that .updn the other. i

What I claim as my invention, and desire'tosccure by Letters Patent, issp o The arrangement of the partially balanced .sliding throttlc-valveinits' casin-g,;by meansof its cylindrical form, and by having the steamopenings on one side and the channel don' the other side of the valveopen to the admission and pressure of the steam, to more than balancethe area'of the ports, so that the valve shallbe pressed against thesteam openings in the seat, but with so slight a pressure as to causebut little friction. andrequire but little force to move it. I v

GEO. MORSE.

Witnesses:

' WILLIAM Hmvnr Currency Humor 0. HOUSTON---

